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Date: Thu, 25 Mar 2010 18:42:31 +0200
From: "Michael S. Tsirkin" <mst@redhat.com>
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Subject: [Qemu-devel] Re: [PATCH v3 1/1] Shared memory uio_pci driver
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To: Cam Macdonell <cam@cs.ualberta.ca>
Cc: Avi Kivity <avi@redhat.com>, kvm@vger.kernel.org, qemu-devel@nongnu.org

On Thu, Mar 25, 2010 at 10:24:20AM -0600, Cam Macdonell wrote:
> On Thu, Mar 25, 2010 at 3:46 AM, Avi Kivity <avi@redhat.com> wrote:
> > On 03/25/2010 08:09 AM, Cam Macdonell wrote:
> >>
> >> This patch adds a driver for my shared memory PCI device using the u=
io_pci
> >> interface. =A0The driver has three memory regions. =A0The first memo=
ry region
> >> is for
> >> device registers for sending interrupts. The second BAR is for recei=
ving
> >> MSI-X
> >> interrupts and the third memory region maps the shared memory. =A0Th=
e device
> >> only
> >> exports the first and third memory regions to userspace.
> >>
> >> This driver supports MSI-X and regular pin interrupts. =A0Currently,=
 the
> >> number of
> >> MSI vectors is set to 4 which could be increased, but the driver wil=
l work
> >> with
> >> fewer vectors. =A0If MSI is not available, then regular interrupts w=
ill be
> >> used.
> >>
> >
> > There is now a generic PCI 2.3 driver that can handle all PCI devices=
. =A0It
> > doesn't support MSI, but if we add MSI support then it can be used wi=
thout
> > the need for a specialized driver.
>=20
> Agreed, I'd be happy to use the generic driver if MSI is there.  What
> would MSI support for UIO look like?  An array of "struct uio_irq" for
> the different vectors?
>=20
> Cam

My idea was to supply a way to bind eventfd to a vector.

> >
> > --
> > error compiling committee.c: too many arguments to function
> >
> >